Supported file formats: 

.mp3, .m4a, mp4, .m4v, .mpg, pdf, .zip.

Supported images formats: 

.jpg, .gif, and .png.


The recommended stereo bit rate and sample rate for audio files:

Stereo Bit Rate:  128 kbps

Sample Rate:  44.1 kHz 

The maximum allowed single file size3GB.
The maximum allowed single image file size1 MB.



In order to be better compatible with iTunes, iPad/tablets, and mobile, we highly recommend you use Mp3 or H.264 based mp4 and m4v.